Kerbweight

I've yet to notice the ATC on my twin axle caravan trigger .... I'm not saying it has never triggered at all, but I've yet to notice it. 🤷‍♂️

At or Under 85% then ?😉

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Under normal conditions, ATC should never deploy. It is only intended to provide assistance in case of necessary sudden and unexpected evasive action. If it does more than that you weren't driving to suit the conditions. One should always be driving as though ATC weren't fitted, without having to rely on such a feature.

I had the ATC trigger towing a t/a through some French village chicanes a few years ago, the road geometry and layout seemed to create the effect of a snake. Otherwise only twice had it perform, both in horrendous cross winds, once caught by a completely out of the blue gust on the M62 on a very hot day in mid summer and the second time we were ‘overtaken’ by a gathering winter storm and had a very hairy, very slow drive from Berwick upto Edinburgh. 

Some may not even notice ATC deploying. I guess it will deploy more frequently as the threshold of instability is approached from whatever cause, weight ratios, loading, speed/steering input or indeed external winds or road conditions. I have noticed uneven road surfaces causing deployment even at relatively low and certainly safe speeds. 

I think the caravan ATC systems are fairly crude compare to cars 

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AD, bit puzzled by your comment, which van do you have? I know of at least 2 people who had ATC retro-fitted to existing vans (with Alko chassis) they owned. 

Viatorem, agree re crudeness but its better than nothing and in my view such systems should be mandatory on new vans with perhaps an allowance of 2 years for owners to retrofit systems onto vans upto 10 years old (although i agree in the absence of caravan MOT’s am not sure how that could be enforced). And for the avoidance of doubt i am not advocating caravan MOT’s! 

I have had two c/vans with ATC fitted and know of a couple of times it has activated once on our previous van coming out of a left turn a bit fast into a gap in traffic, and on out current van when getting caught in the "wash" when overtaking loaded  car transporter

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